Public Vulnerability Reports

WinGate Information Disclosure Vulnerability



WinGate is an Internet sharing and proxy application that allows for
monitoring and remote administration. More information is available at


Remote exploitation of an input validation vulnerability in Qbik WinGate
allows attackers to retrieve arbitrary system files.

WinGate authenticates proxy users via a Java applet served through a
built-in web server. The following request causes the server to retrieve
a file from its root directory which is equivalent to the install
It is possible to retrieve arbitrary files outside the context of the
root directory by preceding the path with an extra slash in the case of
WinGate 5 and two extra slashes in the case of WinGate 6. For example:


Successful exploitation allows unauthenticated remote attackers to
retrieve the contents of arbitrary files. WinGate, by default, runs
under the context of localsystem allowing for the retrieval of backup
Windows SAM files.


iDEFENSE has confirmed that WinGate version 5.2.3 build 901 and version
6.0 beta 2 build 942 are vulnerable. Version 5.0.5 is also reported as
vulnerable. It is suspected that earlier versions are vulnerable as


Disable the WWW Proxy server.


"In general people don't bind their WWW Proxy to external interfaces, so
this exploit is generally not available from the internet.  However it
does seem to bypass local LAN security."

WinGate beta 3 (build 959) addresses the vulnerabilities and is
available for download at:


The Common Vulnerabilities and Exposures (CVE) project has assigned the
names CAN-2004-0577 and CAN-2004-0578 to these issues. This is a
candidate for inclusion in the CVE list (, which
standardizes names for security problems.


09/27/2003    Exploit acquired by iDEFENSE
06/04/2004    Initial vendor notification
06/10/2004    Secondary vendor notification
06/21/2004    iDEFENSE clients notified
06/23/2004    Initial vendor response
07/01/2004    Public Disclosure


An anonymous contributor is credited with discovering this

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Copyright © 2004 Verisign, Inc.

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